2001 Hyundia Accent wont start

A few weeks ago my car was having trouble starting right away. I would have to try and crank it a few time before it would start. Low and behold, I was driving and the car broke down a mile from home. We took the alternator, and battery into the auto parts store had it tested (they both failed), so we replaced and installed the new ones. Car will not start still. We took the starter out and took that too into the auto parts store. It passed still car will not start. We have checked the battery cables for corrosion cleaned and replaced the connectors. What else can be the problem?

Is the car engine turning/ swinging when the key is turned. If the engine is cranking then look at the distributor and the spark plugs and engine timing also it is worth a look at the fuel pump and supply to the injectors there should be a valve similar to the wheel valve on the injector bank press the valve with key on you should see fuel spurt out under pressure as the pump will be keeping the injectors under pressure . If the car is not cranking then look at the starter.

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after u had it jumped u drove it to the zone so the alternator was workin--it seems like the regulator is not functionin to charge batt--theres somethin goin on in the electrics thats frying ur reg these new cars r very complex--do a scan to see any bad codes and a harness wire chec may be helpful

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I would check the vacuum lines thoroughly as one may have collasped or previous owner replaced with a substandard one,which may be partially collaspe then upon warming up will vacuum itself shut causing the motor to surge then fail to run or start if it happens to be a main line that is affected.

I have the same problem with my 2004 Chrsyler Concorde, however mine didn't start doing this until a recall involving reprogramming the cam shaft sensor was done. But I have exact same issues and no trouble codes appear for dealer either. My guess is that it is the cam shaft sensor, which I am going to get replaced. If you solve yours first, please post and let me know.

It maybe as simple as corroded battery terminals. Somtimes they corrode between the post and the terminal itself.When you run light loads there is enough current passing through.When you crank the engine however,the large current flow will not pass. When you jump the car the clamps are biting on the outside of the terminal and current flows easy. Simply clean or replace the terminals and clean the posts as well to a silver shine and the trouble may go away